MCP3421 Analog-to-Digital Converter (ADC)

Microchip's MCP3421 ADC can be used for a variety of high-accuracy analog-to-digital data conversion applications where ease of use, low power consumption, and small footprint are major considerations. It is a single-channel, low-noise, high-accuracy delta-sigma ADC with differential inputs and up to 18 bits of resolution in a small SOT-23-6 package.

The on-board precision 2.048 V reference voltage enables a differential input range of ±2.048 V. The device uses a two-wire I2C-compatible interface and operates from a single power supply ranging from 2.7 V to 5.5 V. The MCP3421 ADC performs conversions at rates of 3.75, 15, 60, or 240 samples per second with corresponding resolutions of 18 bits, 16 bits, 14 bits, and 12 bits. The on-board programmable gain amplifier (PGA) provides up to eight times gain. The device has two conversion modes: continuous and one-shot modes. In one-shot mode, the device automatically enters a low-current standby mode after a conversion, greatly reducing power.